<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>添加留言</title>
</head>
<body>
<form action="liuyan.php" method="post">
    留言内容:<input name="content" type="text">
    <br>
    <input type="submit" value="提交留言">
    <br>
</form>
</body>
</html>